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Krupenin, V. A.; Presnov, D. E.; Zorin, A. B.; Niemeyer, J.

doi:10.1023/a:1004625530034

Cited by 48 publications

(39 citation statements)

References 8 publications

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“…Similar modulation of the noise was seen in Device2. At a frequency of 45 Hz we obtain the charge noise q n as 6x10~6 eA/Hz, which is comparable to the best metallic SET devices reported to date [5]. Theoretically the minimum noise level for a SET is SQmin = /JCAfRq/Rr, where C is the total capacitance, Af the frequency range and RT is the tunneling resistance [6].…”

Section: Introductionsupporting

confidence: 70%

Multiwalled carbon nanotubes as single electron transistors

Ahlskog¹,

Tarkiainen²,

Roschier³

et al. 2001

AIP Conference Proceedings

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Abstract. Single electron transistors (SET) are fabricated from multiwalled carbon nanotubes (MWNT) by manipulation with an atomic force microscope. The devices consist of either a single MWNT with Au contacts at the ends or of two crossing tubes. In the latter device, the lower nanotube acted as the central island of a single electron transistor while the upper one functioned as a gate electrode. Coulomb blockade oscillations were observed on the nanotube at low temperatures. The voltage noise of the nanotube-SET was gain dependent as in conventional SETs. The charge sensitivity at 10 Hz was 6x10~4 e/VHz. Furthermore, in another device where the MWNT is suspended above the substrate between the electrodes, we measure an extremely high charge sensitivity of 6x10~6 e/VHz at 45 Hz, comparable to the best of the conventional SETs.

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Section: Introductionsupporting

confidence: 70%

Multiwalled carbon nanotubes as single electron transistors

Ahlskog¹,

Tarkiainen²,

Roschier³

et al. 2001

AIP Conference Proceedings

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“…When a metallic island is connected to bulk electrodes with two tunnel junctions (SET), the current through the device at low bias (in the Coulomb blockade regime) was shown to be very sensitive to tiny changes in the island potential corresponding to offset charges of 10 −3 e or below [45,46]. The existence and the dynamics of offset charges were clearly identified in metal-based transistors made by electronic lithography techniques (typical island size is 1 µm) [45,47,48,49,50,51], in scanning tunneling spectroscopy measurements on individual and oxidized metallic grains of nanometer size [52,53] and in planar metal-based tunnel junctions [54,55]. In our experiments, the granular Al films are deposited on a thermally grown SiO 2 layer 100 nm thick.…”

Section: B Electrical Measurementsmentioning

confidence: 99%

Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium

Delahaye

Grenet

2008

Eur. Phys. J. B

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We perform electrical field effect measurements at 4 K on insulating granular aluminium thin films. When the samples size is reduced below 100µm, reproducible and stable conductance fluctuations are seen as a function of the gate voltage. Our results suggest that these fluctuations reflect the incomplete self-averaging of largely distributed microscopic resistances. We also study the anomalous field effect (conductance dip) already known to exist in large samples and its slow conductance relaxation in the presence of the conductance fluctuations. Within our measurements accuracy, the two phenomena appear to be independent of each other, like two additive contributions to the conductance. We discuss the possible physical meaning of this independence and in particular whether or not this observation is in favor of an electron glass interpretation of slow conductance anomaly relaxations.

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“…The early experiments in [17] clearly show that the charge noise on close by islands are correlated. The conclusion drawn from this observation, that the charge noise stems mostly from sources in the substrate was further substantiated by [28]. This has important consequences, because it suggests that it is possible to engineer the environment for desired noise configurations.…”

mentioning

confidence: 55%

“…Indeed, analysis in [17] shows that high noise correlations can be achieved for properly designed geometry and layouts of the charge islands. Simple environment engineering was already successful [28,29] in various contexts.…”

mentioning

confidence: 99%

Dispersive manipulation of paired superconducting qubits

et al. 2004

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We combine the ideas of qubit encoding and dispersive dynamics to enable robust and easy quantum information processing (QIP) on paired superconducting charge boxes sharing a common bias lead. We establish a decoherence free subspace on these and introduce universal gates by dispersive interaction with a LC resonator and inductive couplings between the encoded qubits. These gates preserve the code space and only require the established local symmetry and the control of the voltage bias.PACS numbers: 03.67. Lx, 74.50.+r Superconducting nano-circuits consisting of charge boxes (CB) [1] are among the most promising candidates for a quantum computer. Coherent control of a single charge qubit [2], long decoherence time [3] and, more recently, coupled two qubit systems [4] have been demonstrated. But despite this encouraging experimental progress, there are serious difficulties with superconducting QIP which may appear insurmountable. The first is the severe decoherence experienced by these macroscopic qubits, which are coupled to a large number of degrees of freedom in their environment including control circuitry [5]. A few methods have been employed to reduce the decoherence [6,7], but they usually require sophisticated manipulation or significant overhead in the control circuitry. The second major difficulty comes from the imperfect control realizable in solid state systems. Specifically, one finds it difficult to achieve controllable couplings between superconducting qubits, since the commonly used hard-wired inductive or capacitive couplings are untunable. Great effort has been exercised to realize controllable couplings [8,9,10]. Schemes allowing to compute with invariable couplings were also studied [11,12]. Others have recently discussed to use an LC circuit to actively mediate the interaction between superconducting qubits [13,14].The requirement to reduce decoherence and the desire for the easiest manipulation apply to all QIP implementations. Unfortunately, it is not always easy to accomplish both -actually the goals are often contradictory -since reducing decoherence may require extra complication in the manipulation.In this work we show how to achieve both goals. Using a closely placed pair of charge boxes (PCB) sharing a common bias lead as the logic qubit, we can encode information in a fashion immune to collective noise, which is the dominating decoherence source in our setting. We introduce LC resonators inductively coupled to the PCBs whose virtual excitations allow us to manipulate the PCB dispersively; all interactions will be off resonance, without energy transfer [15,16], and thus a logical qubit stays within its encoding space even during manipulation. By inductively coupling the * Electronic address: mikewulf@pas.rochester.edu CBs and taking advantage of dispersive dynamics again, controlled phases can be induced between logical qubits.Combining dispersive dynamics and encoding offers a new method for QIP. It overcomes the major difficulties of superconducting CBs in a realistic and very si...

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Cited by 48 publications

References 8 publications

Multiwalled carbon nanotubes as single electron transistors

Multiwalled carbon nanotubes as single electron transistors

Coexistence of anomalous field effect and mesoscopic conductance fluctuations in granular aluminium

Dispersive manipulation of paired superconducting qubits

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